for the New York and Harlem Railroad. For the horses, he built a half-mile (1 km) indoor training track and large stable complex. He also continued to produce milk as well. The house, whose architect is unknown, but is considered the most architecturally significant in the Harlem Valley. It epitomizes the earlier stage of the Georgian Revival, with its close adherence to classical models and proportions. After Hidden's death in 1918, the house was eventually sold to Sheffield Farms, a large corporate farm that would become by the middle of the century one of New York City's largest providers of milk. Shortly before Sheffield became part of Sealtest in the 1950s, the stable and track burned down. The estate, formerly 410 acres, has been subdivided down to the on which the house sits today . It remains a private home. In the early 1970s an old brick farmhouse and carriage house on the estate that Hidden had kept were demolished by the then-owners, and the original Scomozzi capitals on the front portico's entrance columns were replaced with the current Tuscan ones. Other than the changes to the carriage house, those have been the only significant changes to the property. See also National Register of Historic Places listings in Dutchess County, New York References Houses on the National Register of Historic Places in New York (state) National Register of Historic Places in Dutchess County, New York Georgian Revival architecture in New York (state) Houses completed in 1903 Houses in North East, New York Individually listed contributing properties to historic districts on the National Register in New York (state)